If (u=x^2 tan^{-1} ( frac{y}{x})-y^2 tan^{-1} ( frac{x}{y}) ) then ( – McqOptions

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1.	If (u=x^2 tan^{-1} ( frac{y}{x})-y^2 tan^{-1} ( frac{x}{y}) ) then ( frac{ ^2 u}{ x y} ) is?
A.	( frac{x^2+y^2}{x^2-y^2} )
B.	( frac{x^2-y^2}{x^2+y^2} )
C.	( frac{x^2}{x^2+y^2} )
D.	( frac{y^2}{x^2+y^2} )
Answer» C. ( frac{x^2}{x^2+y^2} )

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